Efficient Analysis Of Electromagnetic Scattering Based On Target Structure Repeatability

In the analysis of the electromagnetic scattering from the objects with identical structure, it is worth to research how to efficiently calculate the electromagnetic scattering characteristics of such objects.To analyze the scattering from multiple eclectic large-scale objects with identical elongated structure effectively, the EPA based on cylinder and sphere equivalence surfaces is presented. Equivalence cylinders are used to enclose each sub-object, and then equivalence spheres are used to enclose each cylinder. According to the equivalence principle, the EM scattering from the sub-objects are substituted by that from the equivalence sources on the cylinder surfaces by multilevel fast multipole algorithm (MLFMA). Similarly, the EM scattering from the equivalence sources on the cylinder surfaces are substituted by that from the equivalence sources on the sphere surfaces computed by the BoR-MoM. The interaction between two spheres is computed by BoR-MoM-ACA. The algorithm takes advantage of geometry identical property, the memory requirement can be reduced drastically. A parallel technology is introduced to analyze the scattering from eclectic large-scale objects.The analysis of the electromagnetic scattering from the conductor and homogeneous dielectric discrete body of revolution (DBOR), which has the characteristic of cylindrically periodic, can be computed by the MoM on combined field integral equation and PMCHW equation. This algorithm can reduce the memory requirement and the impedance matrix filling time drastically. To further accelerate the computation, the ACA algorithm is applied.